2022年芦山6.1级地震和马尔康6.0级地震前的重力变化特征

doi:10.12196/j.issn.1000-3274.2023.01.004

摘要/Abstract

摘要： 地震孕育过程中的地表重力值会发生相应的变化, 利用四川地区2018年3月—2022年4月的流动重力观测数据得到重力场等值线变化图, 研究2022年芦山6.1级地震和马尔康6.0级地震前的重力变化特征。结果表明: ① 芦山6.1级地震和马尔康6.0级地震震前约一年半左右进入重力变化显著时期; ② 芦山6.1级地震对马尔康6.0级地震的发生有促进作用; ③ 芦山6.1级地震和马尔康6.0级地震前震区重力变化等值线出现类似于四象限区域的分布特征, 显示该处应力高度集中; ④ 芦山6.1级地震和马尔康6.0级地震震中区处于0值线附近且0值线在此处转折弧度较大, 是构造带易发震的薄弱位置。

关键词: 重力场等值线变化图, 重力变化特征, 四象限, 转折弧度较大, 薄弱位置

Abstract: The gravity value of the Earth's surface will change accordingly in the process of earthquake preparation. We draw the contour maps of gravity field by using the mobile gravity observation data in Sichuan area from March 2018 to April 2022 and we study the variation characteristics of the gravity field before Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake in 2022 by the contour maps. The results show: ① It was a period of intensive changes in gravity that about one and a half years before the Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake. ② The Lusan M_S6.1 earthquake advanceed the occurrence of the Maerkang M_S6.0 earthquake; ③ The four quadrant area of the gravity variation contour before Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake indicate a high concentration of stress in the area; ④ The epicenters of the Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake were near the zero value line and has a large turning arc and are possible or high risk area for a large earthquake in the tectonic belt.

Key words: Contour map of gravity field, Variation characteristics of the gravity field, Four quadrant area, A large turning arc, High risk area

中图分类号:

P315.7

郑兵, 马伶俐, 王伟力, 温军军, 易天阳, 刘宏伟, 崔靖锋, 竹任国, 白云波. 2022年芦山6.1级地震和马尔康6.0级地震前的重力变化特征[J]. 地震, 2023, 43(1): 42-53.

ZHENG Bing, MA Ling-li, WANG Wei-li, YI Tian-yang, WEN Jun-jun, LIU Hong-wei, CUI Jing-feng, ZHU Ren-guo, BAI Yun-bo. The Variation Characteristics of Gravity Field Before Lusan M_S6.1 Earthquake and Maerkang M_S6.0 Earthquake in 2022[J]. EARTHQUAKE, 2023, 43(1): 42-53.

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